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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c5322ad6adce4309d881db09850ce0a43fb618b87b445fb528ce992fa9c029f' 
  AND token = 'bu5RTSQUdkS5wnXdXb4RgWI8xiF6PDhV6/NImm5mer0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}